/// <summary>
 /// 过滤html标签
 /// </summary>
 /// <param name="strHtml">html的内容</param>
 /// <returns></returns>
 public static string StripHTML(string stringToStrip)
 {
   // paring using RegEx 

   stringToStrip = Regex.Replace(stringToStrip, "</p(?:\\s*)>(?:\\s*)<p(?:\\s*)>", "\n\n", RegexOptions.IgnoreCase | RegexOptions.Compiled);

   stringToStrip = Regex.Replace(stringToStrip, "<br(?:\\s*)/>", "\n", RegexOptions.IgnoreCase | RegexOptions.Compiled);

   stringToStrip = Regex.Replace(stringToStrip, """, "''", RegexOptions.IgnoreCase | RegexOptions.Compiled);

   stringToStrip = StripHtmlXmlTags(stringToStrip);

   stringToStrip = stringToStrip.Replace("&nbsp;", "");

   return stringToStrip;

 }
 private static string StripHtmlXmlTags(string content)
 {
   return Regex.Replace(content, "<[^>]+>", "", RegexOptions.IgnoreCase | RegexOptions.Compiled);
 }